Applying the anisotropy of magnetic susceptibility technique to the study of the tectonic evolution of the West Spitsbergen Fold-and-Thrust Belt

Polar research

Krzysztof Michalski¹  Rafał Szaniawski¹  Katarzyna Dudzisz²  Geoffrey Manby³ 

[1] Institute of Geophysics Polish Academy of Sciences, Ksiecia Janusza 64, PL-01 452 Warsaw, Poland;Institute of Geophysics Polish Academy of Sciences, Ksiecia Janusza 64, PL-01 452 Warsaw, PolandCorrespondence;Natural History Museum of London Great Britain, Cromwell Road, SW7 5BD London, UK

关键词: AMS;    Eurekan orogeny;    tectonic strain;    rock-magnetism;    Hornsund–Sørkapp area;    magnetic fabric.;   

DOI  :  10.3402/polar.v35.31683

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

We demonstrate the use of the anisotropy of magnetic susceptibility (AMS) method to determine the orientation of the principal tectonic strain directions developed during the formation of the West Spitsbergen Fold-and-Thrust Belt (WSFTB). The AMS measurements and extensive rock-magnetic studies of the Lower Triassic rocks reported here were focused on the recognition of the magnetic fabric, the identification of ferromagnetic minerals and an estimation of the influence of ferro- and paramagnetic minerals on magnetic susceptibility. At most sites, the paramagnetic minerals controlled the magnetic susceptibility, and at only one site the impact of ferromagnetic minerals was higher. The AMS technique documented the presence of different types of magnetic fabrics within the sampled sites. At two sites, a normal (Kmin perpendicular to the bedding) magnetic fabric of sedimentary origin was detected. This was associated with a good clustering of the maximum AMS axes imposed by tectonic strain. The Kmax magnetic ...

【 授权许可】

CC BY-NC